No fuel pressure, Fuel gauge went above full and stayed.

woodz72 · July 10th, 2007, 03:49 PM

I'm having a fuel pump problem I have a 96 GT. It has been parked for awhile so when I went to start the car the battery was bad I tried boosting it no go but I did notice the fuel gauge went above the full mark and stayed there. I installed a good battery but cant get it to start I can add fuel through the intake and it will fire up and run till that fuel is burned. When I turn on the key switch the fuel pump isnt running and I have no fuel pressure at all. I checked the voltage at the pump which is 6.5 volts the voltage at the fuel pump kill switch in the trunk is also at 6.5 volts. Voltage seems too low and I cant find a fuel pump relay. I have also noticed a clicking on the passenger side of the engine when the key is turned on (about 3 clicks) never heard it before unless the fuel pump hum disguised it. considering the fuel gauge went to full and stayed and the pump isnt kicking on I thought the pump was down but the voltage makes me think its something electrical possibly caused from the boosting. Any help would be greatly appreciated.

Juggalo_X · July 10th, 2007, 03:52 PM

relay is bad, i beleive its under the hood in the fuse box look at your owners manual it tells you the location. if not you have corrosion some where in the wire or harness

woodz72 · July 10th, 2007, 03:56 PM

No fuel pump relay in the box under the hood. Owners manual doesnt mention it either. I think the relay will be my problem when I locate it.

HMUSN · July 10th, 2007, 03:59 PM

I believe that the relay is bad as well... same thing happened to my SHO.

it isn't in the box but it should be near the box under the hood..

Juggalo_X · July 10th, 2007, 04:05 PM

well check the fues for the fuel pump to be sure that its not corroded or bad and causing resistance. otherwise the relay is most likely in line. also check the inertia switch. it could be bad.

woodz72 · July 10th, 2007, 06:16 PM

I'll check for the relay under the hood see if I can spot it out. Fuses are good and I get 6.5V on both sides of the inertia switch. I'll check for corrosion. I appreciate all the help.

ujslost · July 10th, 2007, 07:58 PM

The electrical system has a fuel pump control relay controlled by the powertrain control module (PCM) which provides power to the fuel pump through an inertia fuel shutoff switch which is normally closed. The electrical system provides power to the fuel pump through two relays:
fuel pump relay and powertrain control module relay.

Locate fuel pump relay in the engine compartment power distribution center and remove fuel pump relay.

July 10th, 2007, 03:49 PM	#1
woodz72 Newbie Join Date: Jul 2007 Posts: 3 iTrader: 0 reviews	No fuel pressure, Fuel gauge went above full and stayed. I'm having a fuel pump problem I have a 96 GT. It has been parked for awhile so when I went to start the car the battery was bad I tried boosting it no go but I did notice the fuel gauge went above the full mark and stayed there. I installed a good battery but cant get it to start I can add fuel through the intake and it will fire up and run till that fuel is burned. When I turn on the key switch the fuel pump isnt running and I have no fuel pressure at all. I checked the voltage at the pump which is 6.5 volts the voltage at the fuel pump kill switch in the trunk is also at 6.5 volts. Voltage seems too low and I cant find a fuel pump relay. I have also noticed a clicking on the passenger side of the engine when the key is turned on (about 3 clicks) never heard it before unless the fuel pump hum disguised it. considering the fuel gauge went to full and stayed and the pump isnt kicking on I thought the pump was down but the voltage makes me think its something electrical possibly caused from the boosting. Any help would be greatly appreciated.

July 10th, 2007, 03:59 PM	#4
HMUSN Doc 1986 SVO Join Date: Nov 2006 Posts: 36,836 iTrader: 9 reviews	I believe that the relay is bad as well... same thing happened to my SHO. it isn't in the box but it should be near the box under the hood.. __________________

July 10th, 2007, 07:58 PM	#7
ujslost MM Fanatic Join Date: Mar 2007 Location: Albertville, AL Posts: 3,920 Blog Entries: 1 iTrader: 1 reviews	The electrical system has a fuel pump control relay controlled by the powertrain control module (PCM) which provides power to the fuel pump through an inertia fuel shutoff switch which is normally closed. The electrical system provides power to the fuel pump through two relays: fuel pump relay and powertrain control module relay. Locate fuel pump relay in the engine compartment power distribution center and remove fuel pump relay. __________________ 1986 Mustang GT t-top time piece!

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July 10th, 2007, 03:52 PM	#2
Juggalo_X I Post Entirely Way Too Much 2001 Mustang 232/CBR600 14+@Slow Join Date: Jan 2007 Location: South Western Ontario Posts: 6,688 iTrader: 0 reviews	relay is bad, i beleive its under the hood in the fuse box look at your owners manual it tells you the location. if not you have corrosion some where in the wire or harness

July 10th, 2007, 03:56 PM	#3
woodz72 Newbie Join Date: Jul 2007 Posts: 3 iTrader: 0 reviews	No fuel pump relay in the box under the hood. Owners manual doesnt mention it either. I think the relay will be my problem when I locate it.

July 10th, 2007, 04:05 PM	#5
Juggalo_X I Post Entirely Way Too Much 2001 Mustang 232/CBR600 14+@Slow Join Date: Jan 2007 Location: South Western Ontario Posts: 6,688 iTrader: 0 reviews	well check the fues for the fuel pump to be sure that its not corroded or bad and causing resistance. otherwise the relay is most likely in line. also check the inertia switch. it could be bad.

July 10th, 2007, 06:16 PM	#6
woodz72 Newbie Join Date: Jul 2007 Posts: 3 iTrader: 0 reviews	I'll check for the relay under the hood see if I can spot it out. Fuses are good and I get 6.5V on both sides of the inertia switch. I'll check for corrosion. I appreciate all the help.

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